Azo-dyestuffs



Patented Aug. 8,

UNITED STATES PATENT OFFICE,

Azo-DYEs'rUFFs Max Schmid, Riehen, and Hans Joiner; Easier,

Switzerland, assignors to Cilia. Einifie i Kasai,

Switzerland, 21. Swiss firn' t No Drawing. Application March-"I9, SIer-ial No. 735,792. In Switzerland Maren 8', 1946 Section 1, Public Law 6903 August: 8,1945 Patent expires Marelr 8; I966- According to this invention valuable new intermediate products are made by treating a compound of the general formula blimwherein X represents an aliphatie hydrocarbon radical, so as to convert the amino group into a hydrexylvg roup;.and convert the latter into" a group --O-Y,.vin which Y represents an aliphatic hydrocarbon. radical d-ifierent from X,- and redueing' the nitro group in the resulting compound to an amino group The compounds of the above formula used as starting materi'ale may be obtained, for example,

by nitrating a compound of the general formula Na -my:

in which X- has the meaning given above,. and hydrolyzi'ngthe acylamin'o group; which may, for example, be a; formy-lamino, acetyla-mino' or benzoylamino group; The nitration may be carried: out, for example, by means' ofdilute nitric acid orina" suitable organic solvent, such as glacialaeetie acid chlorobenzene or nitrobenzene; advantageously at a temperature ranging from G; to 50 C. In this manner thereis obtained a-mixture ot compounds of the general formula and:

(c1. est-2H3 radic'al havii'i'g only few carton atoms; such as an ethyl or prowl radioal. In s'e'me casesinter mediate produets espeeiuny well suited for the production oi azo 'd yes'tufisarwobtained by start; ing from cnmpouudswmcn contain at that posttion a methyl group.

The: conversion: on the amino group into a. hydroxyl group in: the starting materials used" in the invention and having the general formula in which X represents an aliphatic hydrocarbon radical, may be carried out, for example, by heating under pressure in a dilute caustic alkali at a temperature ranging from 100 C. to 150 C.

The hydroxyl group in the resulting 1-nitro-2- hydroxy-5-alkoxybenzenes is etherified. This may be carried out, for example, by treating the compound in the form of an alkali phenolate with an alkyl halide or alkylene halide, such as a bromide and especially a chloride, or a dialkyl sulfate; in which treatment the alkyl radical of the alkylating agent must be 'diiferent from the alkyl radical of the alkoxy group in the 5-position. The use of alkylating agents which contain 2-5 carbon atoms, branched chain compounds and unsaturated compounds coming also into consideration, leads to compounds which may be especially well suited as dyestuff. intermediate products. For example, the following aliphatic hydrocarbon radicals may be introduced into the molecule: methyl, ethyl, propyl, isopropyl, allyl, butyl or amyl.

The nitro-compounds so obtained are reduced to the corresponding amino-compounds by methods in themselves known, for example, by means of iron in alcoholic solution.

The resulting amino compounds are new and correspond to the general formula in which X and Y represent different aliphatic hydrocarbon radicals.

- The compounds are valuable intermediate products for making dyestuffs, especially azo-dyestufis. They may be used, among other uses, as so-called middle components in the manufacture of polyazo-dyestufis, that is to say, they may be coupled with a diazo-com und and the resulting aminoazo-dyestuff diazotized and coupled 'with a suitable coupling component.

A method of use for which the amines of the last-mentioned formula are especially well suited consists in converting them into 2:3-hydroxynaphthoic acid arylides of the general formula in which X and Y represent two different aliphatic radicals. These 2:3-hydroxynaphthoic acid arylides may be made by methods in themselves known, for example, by condensing a 2:3-hydroxynaphthoic acid halide, or a 2:3 hydroxynaphthoic acid itself with the aid of a phosphorus halide, with an amine of the aforesaid formula.

The 2:3-hydroxynaphthoic acid arylides so obtainable and having the general formula in which X and Y re resent different aliphatic hydrocarbon radicals, may be coupled with un- 4 sulfonated diazo-compounds to yield valuable new azo-dyestufi's.

As unsulfonated diazO-compounds for this purpose there come principally into consideration those which are suitable for making ice-colors. Especially good results can be obtained with those 2:3-hydroxynaphthoic acid arylides of the above formula in which X represents a methyl group and Y an aliphatic hydrocarbon radical of 2-5 carbon atoms.

The new azo-dyestuffs of the general formula OH (iF-CH;

E E HsCr- Tints having these properties of fastness cannot be obtained in a simpler manner.

The new products are also valuable as pigments, for example, for coloring artificial masses such as phenoplasts, aminoplasts or spinning masses.

The following examples illustrate the invention, the parts being by weight:

Example 1 1-amino-4-methoxybenzene is converted in known manner into its acetyl-derivative, the latter is nitrated in an organic olvent, such as glacial acetic acid, or in dilute nitric acid, and the acetyl group is split oil from the resulting 3- nitro-i-acetylamino-l-methoxybenzene by hydrolysis by means of dilute caustic soda solution at 60-'70 C. 168 parts of 1-amino-2-nitro-4- methoxybenzene are heated with 200 parts of caustic soda solution of 30 per cent. strength and 2000 parts of water at C. for a few hours in an autoclave. The solution is then acidified. The resulting 1-hydroxy-2-nitro-4-methoxybenzene precipitates in the form of a yellow precipitate melting at 7880 C. It may be separated by filtration and, if desired, purified by distillation with superheated steam or under reduced pressure.

169 parts of l-hydroxy-2-nitro-4-methoxybenzene are dissolved in 400 parts of alcohol, 400 parts of water and 134 parts of caustic soda solution of 30 per cent. strength, 106 parts of sodium carbonate and 97 parts of ethyl chloride are added, and the whole is heated in an autoclave for 8 hours at l001l0 C. The alcohol is then removed by distillation, the residue is illpreferably under reduced pressure.

tered cold, and washed with very dilute caustic soda solution until nothing further is dissolved. In this manner about 170 parts of I-methOXy-TB- nitro-4-ethoxybenzene are obtained in the form of a slightly gold-yellow crystalline .m'ass melting at 42-45 C.

170 parts of 1-methoxye3-nitro 4-,ethoxybenzene are slowly introduced into a reduction liquor, which has been prepared by stirring Lil-'10 parts of powderedironinto 1000 parts of alcohol, adding .17 parts of hydrochloric acid of 30 ,per cent. strength, and boiling for hour in a reflux apparatus while stirring. The whole is "then boiled for'a few hours under refiuxwhilestirring,

until the reduction is finished,,10 par.ts of sodium carbonate are added, and the whole is "filtered hot to remove the residue. After removing alcohol by distillation the base remains behind generally in the form of a somewhat darkcolored oil, which upon cooling solidifies to a crystalline mass. For purification the base is distilled,

It is :obtained the form of a colorless oil, which solidifies to a white crystalline .mass. Melting point 48-90 C. On exposure to 'air it slowly acquires a dark color again. In the form of the hydrochloride the base is stable towards the air.

The compounds in the following table can also be obtained by the process :of this example:

'ibenzeuei are slurred :in 31.26 wants of iehlfliobm" izene, .dzhe .wholeiis heated "up. At 570-80. :16. spurts goi lphosphoxms imiehleride aneslowlly introduced-dropmse. The whole is ithen heated at the tibuiliiior :several hoursiu .a reflux apparatus while stirring. It is then allowed to cool to 8 0C- 1 part of sodium carbonate and 2 parts of sodium acetate are :added, and the whole is distilled with steam, the arylide separating in the form of a precipitate. After all theich-lorobenzene has been driven off, the aqueous suspension is filtered, and the arylide is well washed with hot water. It is dried, preferably under reduced pressure, and iobtsiined ithe form of a slightly yellowish white crystalline powder melting at 158-1 6. In an analogous manner there are obtained from mminohydroquinone-e-methyl 1 epropyl ether, .2--(2"':3"-hydroxynaphthoyl)-aminohydroiquinone-l prepyhe methyl ether melting at 14 7-- 1'50 C.-'; from 2-aminohydro'quinone-1-allyltmthyl ether, 2--('2" :3' hy'droxynaphtheyli aminohydroquinonelallyl l-methyl ether melting at 148-452 (2;; and from 2-auiinohyfiroqu'inone-l-butyli-methyl ether, 2-(2':3-hydrouynaphthoyl) aminohydroq-uinone 1 butyl 4 methyl ether melting at $35438? 0., and from 'Qaaniinohydroquinone-;1--methyl-4-ethyl ether .2- *-(2".:-3' .hydroxynaphthoyl aminohydroquinone- .l--methyl-4-:ethyl ether melting .at 161-153 -.G.

Starting Alkylating 1 Muterial agent NW0 compound Amine NH: 011: J

NO2 .NH: 1 Methyl chloride Cz][s c -Ci s Melting point= 40-42 0. Boiling Melting point=7l 73 C. Boiling moint=.-l78.l80 0. under 14 mm. p0int=150152 0. ,under .14 mm.

:pressure. pressure. o-o 8H1 0-0 3H1 i P 1 ND 2 5 *NlHz 2: ropy z Q chloride 3 j (5-CH: I 954 Melting point: oil. .Boilingpoint= -lilie'llilu'gpoint: oil. Boiling '-point= 185l88 C.'under'-l4 mmrpressure. 17311- :Emmder r14 mm.;pressure.

NH2 Q-C4H0 NO2 v NO2 3 u-Butyl chloride I I OCH: OCH9 Melting point: oil. Boiling point: Melting .point: oil. .'Boiliug,point= 178183 C. under 14 mm. pressure. "I68 l69 0. tmder li mmx-pressure.

l INH-z 'OGH2-CH=C'H2 i0CH2-CH=CH2 *NO2 N03 4; Allyl bromide 1 1 O-CHs O-C-Hs CH Melting pdint: oil. Boiling at 170- Meltluspointz oil. lBoilinget 17.0

C. under 14 mm. pressure. 173" .i1nder14 mm. pressure.

Example 2 .Ezvample '3 18.8 parts of 2:3-hydroxynaphthoic acid and 16.7 parts ofz-amino-hydroquinone-l-ethylimethyl ether (1 methoxy-ii-amino-4-eth0xyi515 :parts of 4-ch1oro 2-amino-1eanisole rare diazotized fin Pknown manner in the form of :the hydrochloride lime hydrochloric :acid suspension,

7 and, ii'req'uired, the diaz'onium salt solution is filtered after hour to'remove 'a smallquantlty of impurities. It is then run into a suspension of 35.1 parts of 1-(2 :3-hydroxynaphthoyl). aminohydroquinone-2-propyl-5 -methyl ether of theformula .I J 'YTT CO-NHV v Example 4 16.2 parts of 2:5-dichloraniline are diazotized in known manner with 25 parts of concentrated hydrochloric acid in'aqueous-suspension with"? parts of sodium nitrite, and, if required, the diazonium salt solution is filtered after Awhour to remove a small quantity of impurities. The

From '1-(2' :3-hydroxynaphthoyl) -aminohydro quinone-2-ethy1-5-methy1 ether and diazotized ortho-nitranilino. meta;chlorenili ne 4-Iiitro-2-amino-l-anisole 4-chloro-2-amino-l:l-diphnnyl ether. 4-cliloro-2-amino-l-anisole dull red 4-011loro-2-amino-l-toluene. scarlet Aminoazotoluene Bordeaux- 4-benzoylamino-5-methyl-2-methoxy-l-amino-ben- From 1(2;3-hydroxynaphtlioyl)-aminohydroqu1- none- 2-propyl-5-methyl ether and diazotized .ortho-uitraniline red meta-chloraniline. scarlet 4-nitro-2-ainino-l-anisole scarlet ,4-chloro-2-aminodipheny1ether.. scarlet 2:5-dicliloraniline orange -ehloro-2=amino-l-toluenc. scarlet ortho-aminoazotoluene bordeam 4- benzoylemino- 5 methyl ethoxy 1- arnlnobenzene.. dull bordeaux 4-benz0y1emino-2:5-dietl1oxy-l-aminobenzene. blue-violet From 1-(2 :3-liydroxynaph1-l1oyl)-aminohydroquinone-2-buty1-5-methylether and diazotized ortho-nitraniline brown orange bright orange 2 5 drchloramhne. yellow scarlet 4-chloro-2-amino-lz l ipbenyl ether scarlet 4-cliloro-Qmmino-l-anisola red 5-nitro-2-amino-l-anisole bluish red 4-eh1oro-2-nitro-l-aniline 4-cl1loro-2-amino-l-toluen scarlet irmethoxy-2-nitro-l-aniliue. borcleaux i 4'- benzoylamino- 5- methyl- 2- methoxy- 1- aminobenzene red-violet 4-benzoylamino-2:5-diethoxy-l-aminobenzcne. blue-violet From l-(2:3-hydroxynepl1thoyl)-aminohydroquinone-2-methyl-5-ethyl ether and diazotized ortho-nitraniline red 2:5-dichlorauiline brownish red 4-elrloro-2-amino-l:1-dipheuy sea 74 gghloroqomino-l-anisole.. red

B-niiro-Q-amino-l-anisole dark'rerl 1-ch1oro-2 amino-l-toluene. red 4-methoxy-2-nitro-l-aniliue bordeaux W ibenzoylamino-2:fi-diethoxy-l-aminobenzene. dark blue solution is then run into a suspension of 33.7

parts of 1- (2' 3'-hydroiryiiaphthoyll aininohydroquinone-2-ethy1-5-methyl ether of the formula v the above 2:3-hydroxynaphthoic acid arylide in i 20 parts of caustic soda solution of '30 per cent.

strength and 130 parts of hot water, diluting with cold water to 1000 parts by volume and, if desired, after the addition of an emulsifying agent such as Turkey red oil, acidifying with dilute acetic acid. Coupling occurs with a beautiful orange-brown coloration and the formation of the insoluble dyestufi. When the coupling is finished the dyestuff is separated by filtration, well washed, and dried. It is an orange-brown powder.

Example 5 Cotton yarn is grounded in known manner with a solution containing, per litre, 3 grams of 1 (2':3' hydroxynaphthoyl) aminohydroquinone-2-ethyl-5-methyl ether and 2 grams of caustic soda solution of 30 per cent. strength. After /2 hour the yarn is well wound and, in order to develop the dyestuif, entered into a solution containin per liter, 2 grams of diazotized 2:5-

dichloraniline. After hour the yarn is wound,

well washed by rinsing hot and cold, then soaped, and finished in the usual manner. A beautiful bright orange-brown dyeing is obtainedhaving very good properties oiiastness.

The following is 9; list of further new dyestuffs which can be made, preferably-on the fibenwith other diazo-components and 2:3-hydroxynaphe .thoic acid arylidesiobtainable by theinvention; .1 75

which has been made by dissolving 33.7 parts of What we claim is: 1. An azo-dyestuff of the general formula in which R represents the radical of an unsulfonated diazo-component of the benzene series suitable for the production of ice-colors, X represents an aliphatic hydrocarbon radical containing a maximum of 3 carbon atoms, and Y represents an aliphatic hydrocarbon radical different from X and containing a maximum of 5 carbon atoms.

2. An azo-dyestufi' of the general formula OH O-CH:

C-N t t in which R represents the radical of an unsulfonated diam-component of the benzeneserles suitable for the production of ice colors and Y represents an aliphatic hydrocarbon radical containing from 2 to 5 carbon atoms. 3. An azo-dyestuif of the general formula 9 10 z in which R represents the radical of an un- 7, The azo-dyestufi of the formula, sulfonated diazo-component of the benzene series suitable for the production of ice colors. Cl

4. An azo-dyestufi of the general formula R-lfii C1 N t n 011 r-02m N T OH 0-02115 ll 0 H in which R represents the radical of an unsul- 0 fonated diazo-component of the benzene series suitable for the manufacture of ice colors 5. The aZo-dyestufi of the formula MAX SCHMID. HANS JOHNE'R.

01 REFERENCES CITED The following references are of record in the --01 file of this patent:

N UNITED STATES PATENTS t, Number Name Date Re. 19,527 Laska et a1. Apr. 9, 1935 OH O CH 1,758,340 Wagner et a1. May 13, 1930 3 1,806,995 Fitzky et a1. May 26, 1931 1,878,243 Laska et al. Sept. 20, 1932 H 1,921,361 Laska et a1. Aug. 8, 1933 O H C 0 1,946,010 Bonhote Feb. 6, 1934 h t if 1 1,975,830 Dahlen Oct. 9, 1934 6. T e azo-dyes u o e ormu a FOREIGN PATENTS G Number Country Date 193,834 Great Britain May 8, 1924 s r 85 336,938 Great Britain Oct. 10, 1930 339,620 Great Britain Dec. 10, 1930 0431135 724,908 France Feb. 5, 1932 727,665 France Mar. 29, 1932 552,282 Germany June 10, 1932 OH O-CH: 

5. THE AZO-DYESTUFF OF THE FORMULA 